Idle Connection force-close ?

Hi, all.

We are running PostgreSQL 7.2.2  (7.4.1 in a few weeks).  We have a
pesky legacy application which periodically leaves open idle
connections.  (I know... fix the application).  In the short term, I
would like to find out if the database engine has a time-out
 configuration option for idle connections where it would force-close
the connections.

Is there such an option?

...john